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Try this: a 3/4" to 1/2" cut off nipple . Screws into the 3/4" feed, has 1/2" thread for bottom of pop up.
The method wet-boots shows is preferred, as it takes more abuse and easier to adjust.
However, the cut off nipples will work fine.

You mentioned using "Hunter MP Rotor". Do you mean 'MP Rotator"? If so, make sure you buy THIS to adjust radius. If you get the variable patter get THIS instead. Has adjustment tool for radius and pattern.
I put some in last month and figured I'd just use a jewelers screw driver to reduce radius. Nope. Smallest screw slot I've ever seen. Need the tool.

There is no easy solution for you . If you are determined to use Rotator nozzles, even if it means spending many more dollars in your application, more power to you.

The way to connect anything to anything is a swing joint, with marlex elbows, swing pipe, and swing-pipe elbows, and in your case, a female coupling or ell to start from the 3/4-inch male threads the old head attached to.

I can attach any head whatsoever to any pipe connection whatsoever, while using five separate pieces of pipe and fittings to do so. You start with a female coupling (or female elbow) and work from there with more elbows and swing pipe. In other words, there are no shortcuts for this.

ok, can you please explain to me what I need to do for my situation? Maybe I used the wrong term "adapter".

What are the 5 separate pieces you use? I'm not being thick - I just need some advice. Thanks

I can attach any head whatsoever to any pipe connection whatsoever, while using five separate pieces of pipe and fittings to do so. You start with a female coupling (or female elbow) and work from there with more elbows and swing pipe. In other words, there are no shortcuts for this.